Reiki, The Lost Explorer

At the beginning of your turn create a blue 2/2 Merfolk Wanderer token.
Merfolk you control gain "{t}: add {u} or {w}
to your mana pool.
At the end of your turn, if 10 or more Merfolk
are tapped, not as a result of combat, transform
"Reiki, The Lost Explorer"
"On Her Journey, Reiki met many travelers. Most
did not know where they were heading, but Reiki
promised she would show them the way home."